Requesting information about iMAX6 Quad DDR3 stress test.

I need to get some information regarding DDR ram calibration and memory stress test for new layout related to iMAX6 Quad hardware design. In my custom design I have included only USB port & SD card slot.

To do stress test for RAM do we need to use SATA HDD ? Can't we use good SD card for that. Or else can I use portable HDD connecting via USB for this ? (I don't have SATA port in my custom hardware design)

The tool will first need to run a DDR initialization script for the specified i.MX SoC (refer to Load Init Script in the GUI tool). Example initialization scripts based on NXP's development boards can be found in this zip file under the script folder. Note, these scripts may need to be modified for your custom board and memory. " <<